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Input-series-output-parallel (ISOP) inverter system is very suitable for high input voltage and high output current power conversion applications. If the inverter system topology is applied to the grid-connected application, a large-capacity grid-connected inverter system can be built with multiple small-capacity standardized inverter modules, which will improve system reliability and facilitate system...
This paper proposes a design scheme of the LCL-filter for space vector PWM (SVM) at the three-level inverter system. Although there are several studies in progress, the conventional methods are erroneous because they do not focus on the other switching methods. This paper shows the design methodology for an LCL-filter optimized in SVM switching. The design sequence for the LCL-filter is presented...
Grid injecting ac current from grid connected inverters contains harmonic components which can be effectively attenuated by LCL type filters with comparably low filter cost. Recent researches tell that the current harmonics stem not only from high order PWM switching itself but also from low order dead time control for the PWM switching. However, low order current harmonics from the dead time control...
This paper presents a virtual circuit controller (VCC), which provides a systematic structured method to stabilize the resonance of an LCL filter in a grid-connected voltage source converter. The semiconductor switches are controlled to mimic the behaviour of a virtual reference circuit. The properly-damped circuit by a resistor in parallel with a filter capacitor is focused on and selected as the...
This paper presents a linear active disturbance rejection control (LADRC) for grid-connected converter with LCL filter. The high rejection performance for external disturbance, internal decoupling, parameter variation is achieved by adopting extended state observer(ESO) and designing controller with direct pole placement. Robustness of parameter uncertainty and sensitivity of input disturbance are...
This paper presents the design for the control scheme of a three-level three-phase neutral-point-clamped quasi-Z-Source inverter which employs an LCL filter for the connection to the grid. A state-feedback based control is developed so as to attain a fully decoupled control of the active and reactive power exchanged with the grid. In addition, a PI regulator is tailored in order to control the dc-link...
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